EP3533638A1 - Reifen - Google Patents

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Publication number
EP3533638A1
EP3533638A1 EP19153408.0A EP19153408A EP3533638A1 EP 3533638 A1 EP3533638 A1 EP 3533638A1 EP 19153408 A EP19153408 A EP 19153408A EP 3533638 A1 EP3533638 A1 EP 3533638A1
Authority
EP
European Patent Office
Prior art keywords
tyre
tyre according
oblique side
range
reference surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19153408.0A
Other languages
English (en)
French (fr)
Other versions
EP3533638B1 (de
Inventor
Koichi Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP3533638A1 publication Critical patent/EP3533638A1/de
Application granted granted Critical
Publication of EP3533638B1 publication Critical patent/EP3533638B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C13/001—Decorating, marking or the like

Definitions

  • the present invention relates to a tyre having improved legibility of a mark provided on a sidewall portion.
  • one or more marks which are letters, symbols, and the like indicating the manufacturer name, brand name, size, and the like of the tyre are formed.
  • the marks are formed to be one step higher than the surface of the sidewall portion and a serrated pattern is formed by arranging a plurality of ridges in parallel on the surface of each of the marks (for example, see Japanese Unexamined Patent Application Publication No. H9-86106 ).
  • each of the ridges mentioned above has an isosceles triangle cross section in which slope angles of both sides are equal to each other, therefore, amount of light reflected by surfaces of the ridges is relatively small. Further, there is little change in contrast between when viewed from one side and when viewed from the other side, therefore, there is room for improvement in terms of the legibility.
  • An object of the present invention is to provide a tyre capable of improving the legibility by increasing the area of the slopes on one side to increase the amount of reflected light so as to bring about a big difference in contrast between one side and the other side.
  • a tyre comprises a sidewall portion provided with a mark indicating portion having one or more marks, wherein the mark indicating portion comprises a reference surface provided on a surface of the sidewall portion and the one or more marks formed on the reference surface, at least a part of a surface of the or each mark is provided with a serration portion in which a plurality of ridges is arranged in parallel, each of the ridges has a triangular or trapezoidal cross section taken perpendicular to a length direction thereof having a first oblique side and a second oblique side, and an angle ⁇ 1 of the first oblique side with respect to the reference surface is different from an angle ⁇ 2 of the second oblique side with respect to the reference surface.
  • between the angle ⁇ 1 and the angle ⁇ 2 is not less than 10 degrees.
  • the or each mark is provided with an edging portion extending along an outer circumference of the or each mark to surround the serration portion thereof, and the edging portion has a height equal to or larger than that of the serration portion.
  • the edging portion is provided with a plurality of small protruding portions each protruding from a surface of the edging portion.
  • each of the small protruding portions is a truncated conical protrusion having a smaller diameter on a side of an upper end thereof.
  • each of the truncated conical protrusions has a maximum diameter in a range of from 50 to 1000 micro meters and a protruding height in a range of from 50 to 1000 micro meters, and a distance between centers of the truncated conical protrusions adjacent to each other is in a range of from 200 to 1000 micro meters.
  • each of the small protruding portions is a rib-shaped protrusion having a trapezoidal cross section with a thickness thereof decreasing toward an upper end thereof, and the rib-shaped protrusions are arranged in parallel to each other or in a non-parallel manner.
  • each of the rib-shaped protrusions has a maximum thickness in a range of from 20 to 1000 micro meters and a protruding height in a range of from 200 to 500 micro meters, and a distance between the rib-shaped protrusions adjacent to each other is in a range of from 10 to 800 micro meters.
  • the surface of the or each mark is inclined with respect to the reference surface in a direction in which a height thereof increases from one side to the other side in a tyre circumferential direction.
  • a mildly sloped one of the first oblique side and the second oblique side is arranged on the one side in the tyre circumferential direction.
  • the mark indicating portion is provided with a base portion projecting from the surface of the sidewall portion at a constant height, and a surface of the base portion forms the reference surface.
  • each of the ridges is formed to have a triangular or trapezoidal cross section in which the angle ⁇ 1 of the first oblique side and the angle ⁇ 2 of the second oblique side are different.
  • an area of an inclined surface on one side (the inclined surface having the first oblique side, for example) of each of the ridges is relatively large, therefore, it is possible that an amount of reflected light is increased. Further, a difference between the amount of the reflected light of the inclined surface on the one side and the amount of the reflected light of the inclined surface on the other side becomes large, therefore, it is possible that a large difference in contrast is brought about between when viewed from one side and when viewed from the other side. And by a synergistic effect of these, it becomes possible that the legibility is improved.
  • a tyre 1 in this embodiment is provided with one or more mark indicating portions 3 in at least one of sidewall portions 2.
  • Each of the mark indicating portions 3 is provided with a reference surface (x) provided on a surface (2s) of a respective one of the sidewall portions 2 and one or more marks 4 formed on the reference surface (x).
  • each of the mark indicating portions 3 is provided with a base portion 5 which projects stepwise from the surface (2s) of a respective one of the sidewall portions 2 at a constant height (H5) (that is, a top surface of the base portion is not inclined with respect to the surface (2s)) and a surface (5s) of the base portion 5 forms the reference surface (x).
  • Each of the marks 4 is a letter, a symbol, a figure, and the like for representing the manufacturer name, brand name, size, and the like of the tyre, and in this embodiment, a case is shown in which a brand name consisting of a plurality of the marks 4 is formed on the reference surface (x).
  • the marks 4 are protruded from the reference surface (x) at a small height.
  • a serration portion 7 in which a plurality of ridges 6 is arranged in parallel is formed on at least a part of a surface (4s) of each of the marks 4.
  • the surface (4s) of each of the marks 4 is composed of the serration portion 7 and an edging portion 8.
  • the edging portion 8 extends along an outer circumference of a respective one of the marks 4 to surround the serration portion 7 thereof.
  • the edging portion 8 has a height equal to or larger than that of the serration portion 7. It is possible that the edging portions 8 configured as such make contour shapes of the marks clear, therefore, they are helpful for improving the legibility.
  • a case is shown in this embodiment where the surface (4s) of each of the marks 4 is inclined with respect to the reference surface (x) in a direction in which a height (H) thereof increases from an end (Fa) on one side in a tyre circumferential direction to an end (Fb) on the other side in the tyre circumferential direction.
  • the height (H) means a height from the reference surface (x).
  • each of the ridges 6 extends linearly along a tyre radial direction.
  • the ridges 6 may be inclined with respect to the tyre radial direction or may be configured to extend along the tyre circumferential direction.
  • each of the ridges 6 is configured such that a cross section taken perpendicular to a length direction of a respective one of the ridges 6 has a triangular shape in which a top portion (Q) is sandwiched by a first oblique side 11 and a second oblique side 12, or a trapezoidal shape such that the top portion (Q) is cut off.
  • the cross section is the triangular shape.
  • a height (h) of each of the ridges 6 and pitches (p) the ridges 6 can be set based on custom. Normally, it is preferred that the height (h) is in the range of from 0.15 to 1.0 mm and the pitch (p) is in the range of from 0.5 to 2.0 times the height (h),
  • an angle ⁇ 1 of the first oblique side 11 with respect to the reference surface (x) is different from an angle ⁇ 2 of the second oblique side 12 with respect to the reference surface (x).
  • the angles ⁇ 1 and ⁇ 2 are indicated by angles on a side of an interior angle. In this embodiment, a case is shown in which the angle ⁇ 1 is smaller than the angle ⁇ 2, that is the first oblique side 11 is mildly sloped as compared with the second oblique side 12.
  • an area of an inclined surface (S1) having the first oblique side 11 which is mildly sloped becomes large, therefore, it is possible that the amount of reflected light is increased. Further, it is possible that a difference in light amount is provided between the inclined surface (S1) having the first oblique side 11 and an inclined surface (S2) having the second oblique side 12, therefore, it is possible that a large difference in contrast is brought about between when viewed from one side and when viewed from the other side. And by a synergistic effect of these, it becomes possible that the legibility is improved.
  • the difference 181-821 is preferably not less than 10 degrees, more preferably not less than 20 degrees, and further preferably not less than 30 degrees. Note that if the angle ⁇ 1 or ⁇ 2 is more than 90 degrees, undercut occurs, therefore, it is possible that rubber chipping occurs in the ridges when the tyre is removed from a vulcanization mold. Thereby, it is preferred that the angle ⁇ 1 or ⁇ 2 is not more than 90 degrees.
  • the first oblique side 11 which is mildly sloped is arranged on a side of the end (Fa) on one side in the tyre circumferential direction.
  • each of the edging portions 8 is provided with a plurality of small protruding portions 15 each protruding from a surface (8s) of a respective one of the edging portions 8, that is the surface (8s) is a surface of the edging portion other than the small protruding portions.
  • each of the small protruding portions 15 is a truncated conical protrusion 16 having a smaller diameter on a side of an upper end thereof is shown.
  • each of the truncated conical protrusions 16 has a maximum diameter (D1) in the range of from 50 to 1000 micro meters and a protruding height (H1) from the surface (8s) of a respective one of the edging portions 8 in the range of from 50 to 1000 micro meters, and that a distance (L1) between centers of the small protruding portions 15 adjacent to each other is in the range of from 200 to 1000 micro meters.
  • the truncated conical protrusions 16 configured as such irregularly reflect light and make the surfaces (8s) of the edging portions 8 look black. Thereby, it is possible that the contour shapes of the marks 4 are made clearer, therefore, it is possible that the legibility of the marks 4 is further improved.
  • the edging portions 8 looks whitish due to the reflection of light, therefore, the contrast difference from the serration portions 7 tends to be decreased.
  • each of the small protruding portions 15 to have a truncated cone shape, it is possible that the reflection of light is further suppressed while the strength is increased as compared with a cylindrical shape.
  • the truncated conical protrusions 16 are arranged in a grid pattern, but they may be arranged in a staggered pattern, or may be randomly arranged as long as the distance (L1) satisfies the above range.
  • Figs, 5A and 5B show another embodiment of the small protruding portions 15.
  • each of the small protruding portions 15 is a rib-shaped protrusion 17 having a trapezoidal cross section with a thickness thereof decreasing toward an upper end thereof.
  • the rib-shaped protrusions 17 can be arranged parallel to each other as shown in Fig, 5A , or they can be arranged so as not to be parallel to each other (non-parallel) as shown in Fig. 5B .
  • each of the rib-shaped protrusions 17 has a maximum thickness (D2) in the range of from 20 to 1000 micro meters and a protruding height (H2) in the range of from 200 to 500 micro meters, and that a distance (L2) between the rib-shaped protrusions 17 adjacent to each other is in the range of from 10 to 800 micro meters. Note that in a case where the rib-shaped protrusions 17 are arranged in the non-parallel manner, it is preferred that an average value of a maximum value (L2max) and a minimum value (L2min) of the distance (L2) is in the range of from 10 to 800 micro meters.
  • the rib-shaped protrusion 17 irregularly reflect light and make the surfaces (8s) of the edging portions 8 look black. Thereby, it is possible that the contour shapes of the marks 4 are made clearer, therefore, it is possible that the legibility of the marks 4 is further improved.
  • the edging portions 8 look whitish due to the reflection of light, therefore, the contrast difference from the serration portions 7 tends to be decreased. Note that, from a point of view of the contrast, it is more preferred that the rib-shaped protrusions 17 are arranged in the non-parallel manner.
  • each of the ridges 6 may be curved in an arc shape, for example.
  • the marks 4 are directly formed on the surface (2s) of a respective one of the sidewall portions 2 without having the base portion 5 formed thereon.
  • the surface (2s) of the sidewall portion 2 forms the reference surface (X).
  • the surface (2s) of each of the sidewall portions 2 is provided with a rib and the like having a small height and surrounding each of the mark indicating portions 3.
  • Tyres provided with the marks 4 on the surfaces (2s) of the sidewall portions 2 were made by way of test according to the specifications listed in Table 1, and then the legibility of the marks 4 was compared.
  • the height (h) (0.5 mm) and the pitch (p) (1.2 mm) of the ridges were the same for all of the test tyres.
  • an inclination angle of the surface (4s) of each of the marks 4 was 7 degrees. Further, in Reference 1 and Example 3 and 4, the height (H) of the surface (4s) of each of the marks 4 from the reference surface (X) was equal to an average value of the heights at the end (Fa) on one side and at the end (Fb) on the other side in the Examples 1, 2, and 5 to 7. In the Examples 1 and 4 to 7, the surfaces of the edging portions were provided with the small protruding portions.
  • the small protruding portions were the truncated conical protrusions each having the maximum diameter (D1) of 320 micro meters and the protruding height (H1) of 500 micro meters, and distance (L1) was 400 micro meters.
  • the small protruding portions were the rib-shaped protrusions each having the maximum thickness (D2) of 160 micro meters and the protruding height (H2) of 200 micro meters, and the distance (L2) was 200 micro meters.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP19153408.0A 2018-02-28 2019-01-24 Reifen Active EP3533638B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2018034038A JP7069827B2 (ja) 2018-02-28 2018-02-28 タイヤ

Publications (2)

Publication Number Publication Date
EP3533638A1 true EP3533638A1 (de) 2019-09-04
EP3533638B1 EP3533638B1 (de) 2021-03-10

Family

ID=65228404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19153408.0A Active EP3533638B1 (de) 2018-02-28 2019-01-24 Reifen

Country Status (3)

Country Link
US (1) US11072207B2 (de)
EP (1) EP3533638B1 (de)
JP (1) JP7069827B2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792082A1 (de) * 2019-09-10 2021-03-17 Continental Reifen Deutschland GmbH Fahrzeugreifen aufweisend einen markierungsbereich

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022166645A (ja) * 2021-04-21 2022-11-02 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2008062A (en) * 1977-11-18 1979-05-31 Goodyear Tire & Rubber Indicia for rubber articles
JPS60160207U (ja) * 1984-04-03 1985-10-24 住友ゴム工業株式会社 タイヤ
JPH0986106A (ja) 1995-09-28 1997-03-31 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2003175707A (ja) * 2001-12-10 2003-06-24 Yokohama Rubber Co Ltd:The 空気入りタイヤ
EP1625952A1 (de) * 2004-08-13 2006-02-15 The Goodyear Tire & Rubber Company Reifen mit erhabenen Markierungen
JP2008265502A (ja) * 2007-04-19 2008-11-06 Yokohama Rubber Co Ltd:The 空気入りタイヤ
US8672008B2 (en) * 2009-09-28 2014-03-18 Compagnie Generale Des Etablissements Michelin High-contrast tire pattern and method for producing same
JP2014223914A (ja) * 2014-09-01 2014-12-04 住友ゴム工業株式会社 空気入りタイヤ

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
JPS6092604U (ja) * 1983-11-30 1985-06-25 住友ゴム工業株式会社 タイヤ
JP3072921B2 (ja) * 1991-07-04 2000-08-07 住友ゴム工業株式会社 空気入りタイヤ
JP3652809B2 (ja) * 1996-09-13 2005-05-25 株式会社ブリヂストン 空気入りタイヤ
US6253815B1 (en) * 1998-08-14 2001-07-03 Michelin Recherche Et Techniques S.A. Design pattern for a tire
KR20030047450A (ko) * 2001-12-10 2003-06-18 한국타이어 주식회사 자동차용 타이어의 사이드월 형상
JP2006224704A (ja) * 2005-02-15 2006-08-31 Bridgestone Corp 空気入りタイヤ
JP5160345B2 (ja) * 2008-08-26 2013-03-13 東洋ゴム工業株式会社 空気入りタイヤ
JP4687811B2 (ja) * 2009-04-10 2011-05-25 横浜ゴム株式会社 空気入りタイヤ
JP2016132386A (ja) * 2015-01-21 2016-07-25 横浜ゴム株式会社 空気入りタイヤ
JP6747932B2 (ja) * 2016-10-11 2020-08-26 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2008062A (en) * 1977-11-18 1979-05-31 Goodyear Tire & Rubber Indicia for rubber articles
JPS60160207U (ja) * 1984-04-03 1985-10-24 住友ゴム工業株式会社 タイヤ
JPH0986106A (ja) 1995-09-28 1997-03-31 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2003175707A (ja) * 2001-12-10 2003-06-24 Yokohama Rubber Co Ltd:The 空気入りタイヤ
EP1625952A1 (de) * 2004-08-13 2006-02-15 The Goodyear Tire & Rubber Company Reifen mit erhabenen Markierungen
JP2008265502A (ja) * 2007-04-19 2008-11-06 Yokohama Rubber Co Ltd:The 空気入りタイヤ
US8672008B2 (en) * 2009-09-28 2014-03-18 Compagnie Generale Des Etablissements Michelin High-contrast tire pattern and method for producing same
JP2014223914A (ja) * 2014-09-01 2014-12-04 住友ゴム工業株式会社 空気入りタイヤ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792082A1 (de) * 2019-09-10 2021-03-17 Continental Reifen Deutschland GmbH Fahrzeugreifen aufweisend einen markierungsbereich

Also Published As

Publication number Publication date
US20190263195A1 (en) 2019-08-29
EP3533638B1 (de) 2021-03-10
US11072207B2 (en) 2021-07-27
JP7069827B2 (ja) 2022-05-18
JP2019147495A (ja) 2019-09-05

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